Plan for Monday, November 9, 2015
9:00
- Memos are graded, see smartsite for comments.
Review
- Columns under compressive loads will most likely buckle before other types of failure.
- Buckling is a catastrophic failure mode, there are no warning signs and it happens suddenly.
- Careful attention for intermediate length columns is needed because theory doesn't predict buckling very well.
- The critical load is modified depending on the end conditions of the column.
- The fixed end conditions are quite conservative.
Goals
- Define static failure and "theory".
- Explain the three types of ductile static failure theories.
9:05
Static failure
9:10
Maximum shear stress theory
9:20
Distortion energy theory
9:30
Coulomb-Mohr theory
9:40
Example
9:45
- HW 5 solutions will be posted today.
- HW 6 will be posted today.
- The initial design memo is due Friday.
- No more than three design ideas, ideally pick one main one to start with an iterate over.
- Should have working sketches and drawings.
- Explanation of how your design will meet core requirements and what other features your are adding.
- Thoughts on material choices.
- What will be the most likely weak spots and what analysis you will need to use.
Questions on project?
Next time: brittle failure theories